| 翻訳と辞書 |
| Westland Lysander ： ウィキペディア英語版 |
Westland Lysander
The Westland Lysander was a British army co-operation and liaison aircraft produced by Westland Aircraft used immediately before and during the Second World War. After becoming obsolete in the army co-operation role, the aircraft's exceptional short-field performance enabled clandestine missions using small, unprepared airstrips behind enemy lines to place or recover agents, particularly in occupied France with the help of the French Resistance. British army air co-operation aircraft were named after mythical or historical military leaders; in this case the Spartan general Lysander was chosen.
==Design and development==
In 1934 the Air Ministry issued Specification A.39/34 for an army co-operation aircraft to replace the Hawker Hector. Initially Hawker Aircraft, Avro and Bristol were invited to submit designs, but after some debate within the Ministry, a submission from Westland was invited as well. The Westland design, internally designated P.8, was the work of Arthur Davenport under the direction of "Teddy" Petter. It was Petter's second aircraft design and he spent considerable time interviewing Royal Air Force pilots to find out what they wanted from such an aircraft. Less clear was whether he or the pilots understood the army co-operation role and what the army wanted, which was tactical reconnaissance and artillery reconnaissance capability - photographic reconnaissance and observation of artillery fire in daylight - up to about behind the enemy front. The result of Petter's pilot enquiries suggested that field of view, low-speed handling characteristics and STOL performance were the most important requirements.
Davenport and Petter worked to design an aircraft around these features: the result was unconventional and looked, by the time of its maiden fight on 15 June 1936, rather dated. The Lysander was powered by a Bristol Mercury air-cooled radial engine and had high wings and a fixed conventional landing gear faired inside large, streamlined spats. The spats had mountings for small, removable stub wings that could be used to carry light bombs or supply canisters. The wings had an unusual reverse taper towards the root, which gave the impression of a bent gull wing, although the spars were perfectly straight. It had a girder type construction with a light wood frame around that to give the aerodynamic shape. The forward part was duralumin tube joined with brackets and plates, and the after part was welded stainless steel tubes. Plates and brackets were cut from channel extrusions rather than forming from sheet steel. The front spar and lift struts were extrusions. The wing itself was fabric covered. A somewhat similar wing layout was also successfully used in a later Polish LWS-3 Mewa army co-operation aircraft and much earlier RWD-6 sports plane.
Despite its appearance, the Lysander was aerodynamically advanced; it was equipped with fully automatic wing slots and slotted flaps〔''Flight'' 1938 p. 572〕 and a variable incidence tailplane. These refinements gave the Lysander a stalling speed of only 65 mph (104 km/h, 56.5 knots).〔Taylor 1969, p. 443.〕 It also featured the largest Elektron alloy extrusion made at the time: a single piece inside the spats supporting the wheels. This was a feature of British-built aircraft only – Canadian-built machines had a conventionally fabricated assembly due to the difficulties involved in manufacturing such a large extrusion. The Air Ministry requested two prototypes of the P.8 and the competing Bristol Type 148, quickly selecting the Westland aircraft for production and issuing a contract in September 1936.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Westland Lysander」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|